John Callahan may refer to:
- John Callahan (actor), best known from the popular soap opera All My Children
- John Callahan (cartoonist), cartoonist
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- John Callahan's Quads!, a 2001 animated television series
- Pelswick, a 2000 animated television series
- John Callahan (Wisconsin politician), Wisconsin Superintendent of Public Instruction
- John B. Callahan, mayor of Bethlehem, Pennsylvania and Democratic nominee for the U.S. House of Representatives
- John F. Callahan, writer and editor of numerous volumes related to African-American literature
- John H. Callahan (1845–1914), American Civil War soldier and Medal of Honor recipient
- John M. Callahan, Chairman of the Democratic Party of Wisconsin
- John Ross Callahan (1853-1918), pioneer in the field of dentistry and particularly dental research
- John Callahan (catcher) (1878-1952), American baseball player
- John Callahan (pitcher) (1875-?), baseball player
Famous quotes containing the words john and/or callahan:
“I’ve been things and seen places.”
—Harvey Thew, screenwriter, John Bright, screenwriter, and Lowell Sherman. Lady Lou (Mae West)
“Children are intensely invested in getting their way. They will devote more emotional and intellectual energy to winning arguments than parents ever will, and are almost always better rested.”
—Jean Callahan (20th century)